.chart_main {
    position: absolute;
    left: 50%;
    top: 50%;
    width:70%;
    height:70%;
    background-color: #191E34;
    transform: translate(-50%,-50%);
    -ms-transform: translate(-50%,-50%); /* IE 9 */
    -webkit-transform: translate(-50%,-50%); /* Safari and Chrome */
}

.chart_inner {
    width:100%;
    height:100%;
}
